You dont need a code to fix the idle you have to change the idle contol valve.Good luck
03 muranos dont have a idle air controll valve, they use the throttle body to compensate for low or high idle bye adjusting the throttle plate. the throttle body is "fly bye wire" type meaning it does not have a throttle cable and the computer adjust it and controlls the throttle opening at the same time. You should have them perform a idle air volume learn with the scan tool and check for vacume leaks.
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